<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 页面侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 展示侧边栏的展开和收缩 -->
        <div class="toggle-button" @click="toggleCollapse">
          <i class="el-icon-s-unfold" v-if="isCollapse"></i>
          <i class="el-icon-s-fold" v-else></i>
        </div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409FEE"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一级菜单模块区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <!-- 是否使用 vue-router 的模式，启用该模式会在激活导航时以 index 作为 path 进行路由跳转 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 页面内容主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        // 第三方插件库
        // '125':'iconfont icon-users',
        // '103':'iconfont icon-tijikongjian',
        // '101':'iconfont icon-shangpin',
        // '102':'iconfont icon-danju',
        // '145':'iconfont icon-baobiao',

        // 官方图标库
        125: "el-icon-s-custom",
        103: "el-icon-s-tools",
        101: "el-icon-s-cooperation",
        102: "el-icon-s-claim",
        145: "el-icon-s-marketing",
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath:''
    };
  },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出功能实现，清除会话token，编程式跳转路由
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    

    // 获取所有左侧菜单
    async getMenuList() {
      // 结构赋值拿到data
      const { data: res } = await this.$http.get("menus");
      // console.log(res);
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menulist = res.data;
    },
    // 点击按钮，侧边栏的展开和收缩
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态，即点击即可高亮
    saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath
      }
  },
};
</script>

<style lang='less' scoped>
.home_container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.toggle-button {
  background-color: #333744;
  font-size: 20px;
  line-height: 24px;
  color: #909399;
  text-align: center;
  cursor: pointer;
}
</style>
